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Bill Minarik<a href="https://fosstodon.org/tags/Zircon" class="mention hashtag" rel="tag">#Zircon</a> and <a href="https://fosstodon.org/tags/Perovskite" class="mention hashtag" rel="tag">#Perovskite</a> are worthy adversaries. Congratulations!Next year is the year of <a href="https://fosstodon.org/tags/sapphirine" class="mention hashtag" rel="tag">#sapphirine</a>. Momentum is building -it received 100's of more votes than last year. Go Blue! Go Sapphirine! <a href="https://fosstodon.org/tags/MInCup23" class="mention hashtag" rel="tag">#MInCup23</a> <a href="https://fosstodon.org/tags/Granulite" class="mention hashtag" rel="tag">#Granulite</a>

Bill Minarik<a href="https://fosstodon.org/tags/Sapphirine" class="mention hashtag" rel="tag">#Sapphirine</a> can form in aluminum-rich rocks (think feldspar) at high temperatures and moderate pressures.Sapphirine could be forming today under Olympus Mons: an indigo-blue crystalline heart to the highest planetary mountain in the solar system. <a href="https://fosstodon.org/tags/MinCup23" class="mention hashtag" rel="tag">#MinCup23</a> <a href="https://fosstodon.org/tags/SolarSystem" class="mention hashtag" rel="tag">#SolarSystem</a> <a href="https://fosstodon.org/tags/Mars" class="mention hashtag" rel="tag">#Mars</a> <a href="https://fosstodon.org/tags/Planet" class="mention hashtag" rel="tag">#Planet</a>

Marco A. Lopez-SanchezKyanite was a key mineral in my PhD thesis, so it will always have my support! Below is a folded kyanite crystal (from my PhD thesis area) Go <a href="https://fediscience.org/tags/kyanite" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#kyanite</a> go! Sorry <a href="https://fediscience.org/tags/Sapphirine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Sapphirine</a> <a href="https://fediscience.org/tags/MinCup23" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MinCup23</a>

Bill MinarikThere's <a href="https://fosstodon.org/tags/sapphirine" class="mention hashtag" rel="tag">#sapphirine</a> in the Blue Ridge of North Carolina! Ocean crust, crumpled and buried under the high Appalachians and cooked to 800°C and 9 kbar (granulite facies). Olivine & plagioclase reacted to sapphirine/cpx intergrowths (black/white zebra stripes in the image).This study was done by Aletha Wachter through NSF Research Experience for Undergrads (REU) projects to Ginny Peterson (now <a href="https://fosstodon.org/tags/GrandValleyState" class="mention hashtag" rel="tag">#GrandValleyState</a>) & Jeff Ryan(<a href="https://fosstodon.org/tags/USF" class="mention hashtag" rel="tag">#USF</a>). Lead Helen Lang (<a href="https://fosstodon.org/tags/WVU" class="mention hashtag" rel="tag">#WVU</a>) sadly has passed away too young. <a href="https://fosstodon.org/tags/MinCup23" class="mention hashtag" rel="tag">#MinCup23</a>

Bill Minarik<a href="https://fosstodon.org/tags/Sapphirine" class="mention hashtag" rel="tag">#Sapphirine</a> growth at high temperatures can help define the path high pressure eclogite facies rocks take to the surface. Sapphirine forming at point "C" and below helps determine that these samples rose 30 km in the crust (16 to 6 kbar) while only cooling a bit over 100°. NE <a href="https://fosstodon.org/tags/Greenland" class="mention hashtag" rel="tag">#Greenland</a> Caledonides work of Synnøve Elvevold (Norwegian Polar Institute, <a href="https://fosstodon.org/tags/Troms%C3%B8" class="mention hashtag" rel="tag">#Tromsø</a>) and Jane Gilotti (<a href="https://fosstodon.org/tags/UIowa" class="mention hashtag" rel="tag">#UIowa</a>) <a href="https://fosstodon.org/tags/MinCup23" class="mention hashtag" rel="tag">#MinCup23</a>

okanogen VerminEnemyFromWithinI know <a href="https://mastodon.social/tags/kyanite" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#kyanite</a> is more common, but it really doesn't have much else going for it. It's blue. Ok. So is the sky and ocean. <a href="https://mastodon.social/tags/sapphirine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sapphirine</a> is my jam in this matchup. Rare, handsome, very hard.... works for me. <a href="https://mastodon.social/tags/MinCup23" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MinCup23</a>

Vicky VeritasYou are here. We are currently in Round 1 Match 15: <a href="https://c.im/tags/Sapphirine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Sapphirine</a> versus <a href="https://c.im/tags/Kyanite" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Kyanite</a> <a href="https://c.im/tags/MinCup23" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MinCup23</a>

Vicky Veritas<a href="https://c.im/tags/Sapphirine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Sapphirine</a> is a high-grade metamorphic mineral found in rocks from deep in the crust. <a href="https://c.im/tags/MinCup23" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MinCup23</a>More: <a href="https://www.alexstrekeisen.it/english/meta/sapphirine.php" rel="nofollow noopener noreferrer" target="_blank">https://www.alexstrekeisen.it/english/meta/sapphirine.php</a>

cobalt going beige today<a href="https://mastodon.social/@FaithfullJohn" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@FaithfullJohn</a> <a href="https://fosstodon.org/@silicatefondue" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@silicatefondue</a> <a href="https://calckey.club/@jolyon" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@jolyon</a> Well there, another new-to-me mineral! I’ll vote for it because it’s interesting. I have always been irritated by <a href="https://awscommunity.social/tags/Kyanite" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Kyanite</a> because I’ve only seen about a couple tons of it and almost always poor quality. Literal tons. It’s always at the Tucson show in the big tents, sold in chunks, roughs, quantity from Afghanistan. These specimens are quite interesting for <a href="https://awscommunity.social/tags/Sapphirine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Sapphirine</a>.

Mineral Cup<a href="https://mastodon.social/tags/MinCup23" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MinCup23</a> Round 1 Match 15 is blue. Very blue. Metamorphically blue.Pick one: newbie <a href="https://mastodon.social/tags/Sapphirine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Sapphirine</a> vs returning <a href="https://mastodon.social/tags/Kyanite" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Kyanite</a>. Vote: <a href="https://www.mineralcup.org/2023/campaigns/round-1-match-15" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://www.mineralcup.org/2023/campaigns/round-1-match-15</a>Results: <a href="https://www.mineralcup.org/results/round-1-match-15" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://www.mineralcup.org/results/round-1-match-15</a>

Bill MinarikOne more resource before <a href="https://fosstodon.org/tags/MinCup23" class="mention hashtag" rel="tag">#MinCup23</a> voting starts: during the pandemic we discovered the <a href="http://www.alexstrekeisen.it/" target="_blank" rel="nofollow noopener noreferrer" translate="no">http://www.alexstrekeisen.it/</a> site run by Alessandro Da Mommio (in Italian and English). It's chock-full of sample and thin section photos, well organized.Blue <a href="https://fosstodon.org/tags/sapphirine" class="mention hashtag" rel="tag">#sapphirine</a> is well represented: here a reaction texture between sillimanite and cordierite, in thin section. <a href="https://fosstodon.org/tags/mineralogy" class="mention hashtag" rel="tag">#mineralogy</a> <a href="https://fosstodon.org/tags/thinSection" class="mention hashtag" rel="tag">#thinSection</a> <a href="https://fosstodon.org/tags/photography" class="mention hashtag" rel="tag">#photography</a>

Bill Minarik<a href="https://fosstodon.org/tags/Sapphirine" class="mention hashtag" rel="tag">#Sapphirine</a> has a complicated structure, with Mg in two sites and Al both four-fold and six-fold coordinated. It has only about 15 wt% SiO2.It has monoclinic symmetry, but still can form attractive crystal faces when it can grow unimpeded. A good example is on the cover of Dexter Perkin’s on-line mineralogy text, found at: <a href="https://opengeology.org/Mineralogy/" target="_blank" rel="nofollow noopener noreferrer" translate="no">https://opengeology.org/Mineralogy/</a>In polarized light, sapphirine changes color with orientation (called pleochroism).<a href="https://fosstodon.org/tags/MinCup23" class="mention hashtag" rel="tag">#MinCup23</a> <a href="https://fosstodon.org/tags/Minerals" class="mention hashtag" rel="tag">#Minerals</a> <a href="https://fosstodon.org/tags/Mineralogy" class="mention hashtag" rel="tag">#Mineralogy</a> <a href="https://fosstodon.org/tags/ThinSection" class="mention hashtag" rel="tag">#ThinSection</a>

John Faithfull🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡 ✊🏼✊🏿<a href="https://fosstodon.org/@silicatefondue" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@silicatefondue</a> <a href="https://calckey.club/@jolyon" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@jolyon</a> This specimen of <a href="https://mastodon.social/tags/sapphirine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sapphirine</a> with phlogopite from Fiskenaesset, Greenland was given by Giesecke himself to the Scottish mineralogist and collector, Thomas Brown (1774-1853). His collections are mostly in the <a href="https://mastodon.social/tags/Hunterian" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Hunterian</a> museum, University of Glasgow. <a href="https://www.gla.ac.uk/collections/#/details?irn=20699&catType=C&referrer=/results&q=sapphirine" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://www.gla.ac.uk/collections/#/details?irn=20699&catType=C&referrer=/results&q=sapphirine</a>

Bill MinarikThe Nuuk area in western Greenland (the type locality of <a href="https://fosstodon.org/tags/Sapphirine" class="mention hashtag" rel="tag">#Sapphirine</a>) is one of the places where sea level is falling! Not only is ice melting, uncovering new rocks and unloading the lithosphere, but the mass of ice that's missing no longer attracts the water, so it recedes. Read more at the Arctic Hub: <a href="https://arctichub.gl/greenland-is-rising-literally/" target="_blank" rel="nofollow noopener noreferrer" translate="no">https://arctichub.gl/greenland-is-rising-literally/</a> <a href="https://fosstodon.org/tags/MinCup23" class="mention hashtag" rel="tag">#MinCup23</a> <a href="https://fosstodon.org/tags/Greenland" class="mention hashtag" rel="tag">#Greenland</a> <a href="https://fosstodon.org/tags/Cryosphere" class="mention hashtag" rel="tag">#Cryosphere</a> <a href="https://fosstodon.org/tags/SeaLevel" class="mention hashtag" rel="tag">#SeaLevel</a>

Bill MinarikSapphirine's type locality is in western Greenland, south of Nuuk, which is where the mineral was discovered in 1809 by Karl Giesecke.It was named due to its blue color being similar to sapphire, a different, associated mineral (<a href="https://fosstodon.org/tags/corundum" class="mention hashtag" rel="tag">#corundum</a>, aluminum oxide).An amazing amount of information can be found about <a href="https://fosstodon.org/tags/sapphirine" class="mention hashtag" rel="tag">#sapphirine</a> at MinDat: <a href="https://www.mindat.org/min-3531.html" target="_blank" rel="nofollow noopener noreferrer" translate="no">https://www.mindat.org/min-3531.html</a> a non-profit mineral data base founded in 2000 by Jolyon Ralph (who is on Mastodon at <a href="https://calckey.club/@jolyon" class="u-url mention">@jolyon</a>).<a href="https://fosstodon.org/tags/MinCup23" class="mention hashtag" rel="tag">#MinCup23</a> <a href="https://fosstodon.org/tags/Minerals" class="mention hashtag" rel="tag">#Minerals</a> <a href="https://fosstodon.org/tags/Greenland" class="mention hashtag" rel="tag">#Greenland</a>

Bill MinarikThe vivid blue mineral <a href="https://fosstodon.org/tags/sapphirine" class="mention hashtag" rel="tag">#sapphirine</a> is found in meteorites, forming from nebular gas and earlier condensed minerals. It's found on Earth, and likely all terrestrial planets, as a crustal metamorphic mineral (more to come).Sapphirine is a magnesium aluminum silicate, with iron, chromium, and others substituting.It's used as a gemstone. This photo is presented in: <a href="https://geo.libretexts.org/Bookshelves/Geology/Gemology" target="_blank" rel="nofollow noopener noreferrer" translate="no">https://geo.libretexts.org/Bookshelves/Geology/Gemology</a>This is an Open Textbook made available by UC Davis, along with many others.<a href="https://fosstodon.org/tags/MinCup23" class="mention hashtag" rel="tag">#MinCup23</a> <a href="https://fosstodon.org/tags/Minerals" class="mention hashtag" rel="tag">#Minerals</a> <a href="https://fosstodon.org/tags/Geology" class="mention hashtag" rel="tag">#Geology</a>

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